save project

diy.py

+# 写入同学们的捐赠明细：'小兰：12本'、'小丽：11本'、'李文：9本'、'张伟：16本'
+# file=open(r"C:\Users\Lenovo\Desktop\新建文件夹\book.txt",'w',encoding='utf-8')
+# file.write('小兰:12本')
+# file.close()
+new_date=""
+with open(r"C:\Users\Lenovo\Desktop\新建文件夹\book.txt","r",encoding="utf-8") as file:
+    for date in file:
+        if '小兰:12本' in date:
+            date=date.replace('小兰:12本','小兰:10本')
+        new_date+=date
+with open(r"C:\Users\Lenovo\Desktop\新建文件夹\book.txt","w",encoding="utf-8") as file:
+    file.write(new_date)
+with open(r"C:\Users\Lenovo\Desktop\新建文件夹\book.txt","r",encoding="utf-8") as file:
+    a=file.read()                
+    print(a)
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